<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>在线聊天</title>
    <script src="https://unpkg.com/vue@2.7.14/dist/vue.min.js"></script>
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
    </script>
    <script src="https://unpkg.com/element-ui/lib/index.js"></script>
</head>
<body>
<div id="app" style="height: 100%">
    <header class="p900 flexbtw">
        <h3>在线聊天、在线客服</h3>
        <div>
            欢迎 {{id}}
            <a href="#">退出</a>
        </div>
    </header>
    <main class="m900 flexbtw" style="height: calc(100% - 75px)">
        <aside>
            <div v-for=" id in onlines">{{id}}</div>
        </aside>
        <article>
            <div id="msgs">
                <div v-for="m in msgs" :class="{send: m.id==id, recv: m.id!=id}">
                    <label class="user">{{m.id}}</label>
                    <span class="msg">{{m.msg}}</span>
                </div>
            </div>
            <textarea placeholder="Ctrl + Center 发送" id="msg" v-model.trim="msg"></textarea>
            <div id="ops">
                <input v-model="id" placeholder="用户名">
                <button @click="login">登录</button>
                <button @click="send">发送</button>
            </div>
        </article>
    </main>
    <footer>源辰公司</footer>
</div>
<script>
    var v = new Vue({
        el: "#app",
        data: {
            ws: null,
            id: null,
            onlines: [],
            msgs: [],
            msg: ""
        },
        methods: {
            login() {
                if (!this.id) {
                    this.$alert("请填写用户id!");
                    return;
                }
                this.ws = new WebSocket("ws://localhost/talk/" + this.id)
                this.ws.onopen = () => {
                    this.$message(this.id + "连接成功!");
                }
                this.ws.onclose = () => {
                    this.$message(this.id + "关闭成功!");
                }
                this.ws.onerror = (e) => {
                    this.$message(this.id + "错误!" + e);
                }
                this.ws.onmessage = (data) => {
                    let json = data.data;
                    let obj = JSON.parse(json);

                    if (Array.isArray(obj)) {
                        // 更新在线人数
                        this.onlines = obj;
                    } else {
                        // 更新消息
                        this.msgs.push(obj);
                    }
                }
            },
            send(){
                if(!this.msg){
                    this.$alert("请输入消息!");
                    return;
                } else {
                    this.ws.send(this.msg);
                    this.msg = '';
                }
            }
        }
    })
</script>
</body>
</html>


<style>
    * {
        padding: 0px;
        margin: 0px;
        font-family: "Arial", "Microsoft YaHei", "黑体", "宋体", sans-serif;
    }

    html, body {
        height: 100%;
    }

    body {
        display: flex;
        flex-direction: column;
    }

    a {
        text-decoration: none;
    }

    button {
        padding: 3px 10px;
    }

    .p900 {
        padding: 0px calc((100% - 900px) / 2);
    }

    .m900 {
        width: 900px;
        margin: 0px auto;
    }

    .flexbtw {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    header {
        background-color: #eee;
        flex: none;
    }

    header > h3 {
        margin: 10px 0px;
    }

    main {
        flex: auto;
        background-color: #ddd;
    }

    footer {
        flex: none;
        padding: 5px;
        text-align: center;
        background-color: #eee;
    }

    aside {
        width: 200px;
        height: 100%;
        background-color: #ccc;
        flex: none;
    }

    article {
        height: 100%;
        flex: auto;
    }

    article {
        display: flex;
        flex-direction: column;
    }

    #msgs {
        flex: auto;
        box-sizing: border-box;
        padding: 10px;
    }

    #msg {
        flex: none;
        width: 100%;
        height: 100px;
        box-sizing: border-box;
    }

    .send > * {
        float: right;
    }

    .recv > * {
        float: left;
    }

    .send, .recv {
        clear: both;
        padding: 5px 0px;
    }

    .user, .msg {
        padding: 5px;
    }

    .msg {
        background-color: #e9e9e9;
        border-radius: 3px;
    }

    aside > div {
        text-align: center;
        padding: 10px;
        margin: 3px;
        background-color: #8c939d;
    }

    aside > div:hover {
        background-color: #8c939d55;
        cursor: pointer;
    }

    #ops {
        text-align: right;
        padding: 7px;
    }

    #ops > * {
        box-sizing: border-box;
        height: 25px;
        vertical-align: middle;
        margin: 0px 5px;
        text-align: center;
    }

    textarea {
        padding: 3px;
    }
</style>